Cress by Marissa Meyer

Cinder, Scarlet, Wolf, and Thorne have all found each other. They’re hiding in space right now, busy trying to recover from devastating attacks on the earth – when they are paged by a girl trapped on a satellite, desperate to escape. Her name is Cress, and she’s hopeful that Cinder and Company are the chance she needs to get away from her cruel mistress.

But when the rescue attempt goes awry, Cinder’s party is separated. Cress and Thorne are stranded in the middle of a desert, while the others are all lost somewhere in space.